Saving Old Seagulls

Hi all, I’m hoping one of you can help identify the year/model for this one:

http://r.ebay.com/3kE3WV

The serial number in the photos seems to be missing the leading letter(s), so I asked seller to confirm and they came back with 471B8. This is what I see too; is this a mis-stamp? I’m thinking it should have an F in there somewhere...

Thanks!

It has got an F!

It's above and left of the serial, nearly out of sight, but it's there!

http://www.saving-old-seagulls.co.uk/i_ ... Num=f471B8

Yes looks like a Featherweight to me.
H-A

Ah, there it is! I’ve seen some crooked stamps before but never that far off!
Thanks for quick feedback